请教七月数学JJ题2

joy

1,In a goose migration study, the total male goose is 30 percent of all gooses, and the 20 percent of the migrated gooses are male gooses. ask the ratio of the male goose migration rate to the female goose migration rate... (7/12)

2,one unit 64%person were employed and 48%was employed male,the percentage of employed was female.(B)
A,52%,B25%,C,16%

请问这怎么算出来的?什么样的思路?谢谢各位牛人了.

btw999

(20%/30%)/(80%/70%)
16%/64%

joy

btw999,thaks very very much!!!